The largest wildfire in the US has burned almost 400,000 acres July 22, 2021 9:47 PM CNN Spencer Platt/Getty Images The largest wildfire in the United States approached 400,000 acres burned with containment at just 38%, officials said Thursday. The Bootleg Fire has charred 399,359 acres in southern Oregon, including some land that is set aside for carbon offsets. “The fire will continue to be extremely active with gusty winds and extremely dry fuels,” says an update posted to InciWeb, the national clearinghouse for wildfire information. Officials in recent days have touted progress against the massive fire, which was started July 6 by lightning. “Fire crews and support personnel have made significant progress in containing this fire in the last few days,” Joe Prummer of the Northwest Interagency Incident Management Team said. “However, we still have a long road ahead of us to ensure the safety of the surrounding communities.”